feat(ownership): Phase 9 — Ownership & Daily Operations [FASE-9]

Backend:
- TechniqueOwnership model: per-technique owner, backup owner, team
- RevalidationQueueItem model: prioritised analyst work queue
  (critical/high/medium/low, reasons: validation_expired/infra_change/
   osint_alert/mitre_update/rule_modified/low_confidence/manual)
- Migration b035ownerq: creates technique_ownerships and
  revalidation_queue_items tables with full indexes

Services:
- ownership_service: set/get technique ownership, bulk assign by tactic
  or platform, orphan reports for techniques and assets
- revalidation_queue_service: smart queue generation (scans expired
  validations, low-confidence techniques, recent infra changes),
  list/create/update queue items, analyst dashboard

Router /api/v1/ownership:
  GET/PUT /ownership/techniques/{id}   — technique ownership
  PATCH   /ownership/assets/{id}       — asset ownership
  GET     /ownership/orphans/techniques — orphan report
  GET     /ownership/orphans/assets     — orphan report
  POST    /ownership/bulk-assign        — bulk by tactic/platform
  GET/POST /ownership/queue             — revalidation queue CRUD
  PATCH   /ownership/queue/{id}         — update item status/assignee
  POST    /ownership/queue/generate     — scan & generate items
  GET     /ownership/analyst-dashboard  — personalised daily view

Scheduler: queue_generation job daily at 02:30 (after decay engine)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/schemas/ownership_queue_schema.py

@@ -0,0 +1,131 @@
+"""Pydantic schemas for Phase 9: Ownership & Revalidation Queue."""
+
+from datetime import datetime
+from typing import Optional
+from uuid import UUID
+
+from pydantic import BaseModel, ConfigDict, field_validator
+
+
+# ── Technique Ownership ───────────────────────────────────────────────────────
+
+class TechniqueOwnershipSet(BaseModel):
+    """Set (create or replace) ownership for a technique."""
+    owner_id: Optional[UUID] = None
+    backup_owner_id: Optional[UUID] = None
+    team: Optional[str] = None
+    notes: Optional[str] = None
+
+
+class TechniqueOwnershipOut(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: UUID
+    technique_id: UUID
+    owner_id: Optional[UUID] = None
+    backup_owner_id: Optional[UUID] = None
+    team: Optional[str] = None
+    notes: Optional[str] = None
+    assigned_at: Optional[datetime] = None
+    assigned_by: Optional[UUID] = None
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+
+
+class DetectionAssetOwnershipPatch(BaseModel):
+    """Update ownership fields on a detection asset."""
+    owner_id: Optional[UUID] = None
+    backup_owner_id: Optional[UUID] = None
+    team: Optional[str] = None
+
+
+# ── Bulk Assignment ───────────────────────────────────────────────────────────
+
+class BulkAssignRequest(BaseModel):
+    """Bulk-assign ownership by tactic, platform, or team filter."""
+    owner_id: Optional[UUID] = None
+    backup_owner_id: Optional[UUID] = None
+    team: Optional[str] = None
+    # Filters — at least one must be set
+    tactic: Optional[str] = None          # assign all techniques with this tactic
+    platform: Optional[str] = None        # assign all detection assets with this platform
+    overwrite: bool = False               # overwrite existing assignments
+
+
+class BulkAssignResult(BaseModel):
+    assigned_count: int
+    skipped_count: int
+    target_type: str  # "technique" or "detection_asset"
+
+
+# ── Revalidation Queue ────────────────────────────────────────────────────────
+
+class QueueItemPatch(BaseModel):
+    """Update a revalidation queue item."""
+    status: Optional[str] = None
+    assigned_to: Optional[UUID] = None
+    priority: Optional[str] = None
+    due_date: Optional[datetime] = None
+
+    @field_validator("status")
+    @classmethod
+    def validate_status(cls, v):
+        from app.models.ownership_queue import QueueStatus
+        if v is not None:
+            try:
+                QueueStatus(v)
+            except ValueError:
+                raise ValueError(f"Invalid status: {v}")
+        return v
+
+    @field_validator("priority")
+    @classmethod
+    def validate_priority(cls, v):
+        from app.models.ownership_queue import QueuePriority
+        if v is not None:
+            try:
+                QueuePriority(v)
+            except ValueError:
+                raise ValueError(f"Invalid priority: {v}")
+        return v
+
+
+class QueueItemCreate(BaseModel):
+    """Manually create a queue item."""
+    technique_id: Optional[UUID] = None
+    detection_asset_id: Optional[UUID] = None
+    priority: str = "medium"
+    reason: str = "manual"
+    reason_detail: Optional[str] = None
+    assigned_to: Optional[UUID] = None
+    due_date: Optional[datetime] = None
+
+
+class QueueItemOut(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: UUID
+    technique_id: Optional[UUID] = None
+    detection_asset_id: Optional[UUID] = None
+    priority: str
+    reason: str
+    reason_detail: Optional[str] = None
+    status: str
+    assigned_to: Optional[UUID] = None
+    due_date: Optional[datetime] = None
+    created_at: Optional[datetime] = None
+    completed_at: Optional[datetime] = None
+    dismissed_at: Optional[datetime] = None
+    completed_by: Optional[UUID] = None
+    extra: Optional[dict] = None
+
+
+# ── Analyst Dashboard ─────────────────────────────────────────────────────────
+
+class AnalystDashboard(BaseModel):
+    """Personalised daily workday view for an analyst."""
+    my_pending_items: list[QueueItemOut]
+    expiring_validations_7d: list[dict]
+    recent_infra_changes: list[dict]
+    my_low_confidence_techniques: list[dict]
+    summary: dict